This page list all events and seminars that take place in the department this week. Please use the form below to choose a different week or date range.

AGNT

DGAs with polynomial homology

Nov 20, 15:10—16:25, 2019, -101

Speaker

Haldun Özgür Bayindir (Haifa)

Abstract

Differential graded algebras(DGAs) are one of the most important objects of study in homological algebra. These are chain complexes with an associative and unital multiplication. Examples of DGAs include cochain complexes of topological spaces equipped with the cup product.

In this talk, I present our recent classification results on DGAs with polynomial homology. These results are obtained by exploiting interesting interactions between DGAs and stable homotopy theory. I am going to start my talk by stating these classification results. For the rest of the talk, I am going to present how stable homotopy theory comes into play for the classification of DGAs. This presentation is going to be accessible to a general audience.

BGU Probability and Ergodic Theory (PET) seminar

On the failure of Ornstein’s theory in the finitary category.

Nov 21, 11:10—12:00, 2019, -101

Speaker

Uriel Gabor (The Hebrew University)

Abstract

I’ll show the invalidity of finitary counterparts for three theorems in classification theory: The preservation of being a Bernoulli shift through factors, Sinai’s factor theorem, and the weak Pinsker property. This gives a negative answer to an old conjecture and to a recent open problem.

Colloquium

On bounded continuous solutions of the archetypal equation with rescaling

Nov 26, 14:30—15:30, 2019, Math -101

Speaker

Gregory Defel (BGU)

אשנב למתמטיקה

חבורות והצגות שלהן פוגשות קבוצות קמורות

Nov 26, 16:10—17:30, 2019, אולם 101-

Speaker

איתן סייג

Abstract

טרנספורם רדון הוא כלי מתמטי בעל חשיבות רבה ברפואה ובהנדסה. נציג את הטרנספורם ואת המתמטיקה מאחורי נוסחת ההיפוך. אחר כך נפנה לשימוש בסימטריות, חבורות והצגות שלהן כדי ללכסן את הטרנספורם ולהראות כי הוא הפיך. בדרך נפגוש את הלמה של Schur את הלפלסיאן וגם גזירה שבורה של פונקציות.


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